@misc{_Mapka_[ca,
 copyright={Public Domain},
 address={Łódź},
 howpublished={online},
 year={[ca 1915]},
 publisher={nakład K. N.},
 language={pol},
 title={Mapka Królestwa Polskiego 1914-15},
 keywords={chorographic maps, road maps, Kingdom of Poland, Poland, 20th century, postcards},
}